Hacking Hardware Picofly - a HWFLY switch modchip

binkinator · Feb 6, 2023

Data sheet for that IRFHS8342 chip:

https://www.mouser.com/datasheet/2/196/Infineon_IRFHS8342_DataSheet_v01_01_EN-1228323.pdf

it‘s a QFN so I guess they are suggesting you solder it right to the CPU hence the need to remove a cap and put something to isolate that one leg from touching anything else on the Mariko chip. Kinda Jerry rigged but OK.

Mansi · Feb 6, 2023

vittorio said:
according to me on 4pda someone has the fw without controls,try to ask

no one has

rehius said:
Ubuntu work
HOS not work

have proof?
or need test?)

Tafty · Feb 6, 2023

saladus said:
oh shit is this legit? @Tafty

just flashed it and it is doing something...then failing, i dont have a IRFHS8342 installed in this currently, and would have to order one to actually test. i dont know if its worth doing at the minute.

Deleted member 194275 · Feb 6, 2023

Well... It's time to buy a RP-2040 then...

Mansi · Feb 6, 2023

Tafty said:
just flashed it and it is doing something...then failing, i dont have a IRFHS8342 installed in this currently, and would have to order one to actually test. i dont know if its worth doing at the minute.

use you cpu flat cable.

RexSonic · Feb 6, 2023

binkinator said:
Data sheet for that IRFHS8342 chip:

https://www.mouser.com/datasheet/2/196/Infineon_IRFHS8342_DataSheet_v01_01_EN-1228323.pdf

it‘s a QFN so I guess they are suggesting you solder it right to the CPU hence the need to remove a cap and put something to isolate that one leg from touching anything else on the Mariko chip. Kinda Jerry rigged but OK.

What do you need that specific chip for ?

Tafty · Feb 6, 2023

Mansi said:
use you cpu flat cable.

I have, is that the same thing?

Mansi · Feb 6, 2023

Tafty said:
I have, is that the same thing?

yes
These mosfets are installed on your cable

Piorjade · Feb 6, 2023

Tafty said:
just flashed it and it is doing something...then failing, i dont have a IRFHS8342 installed in this currently, and would have to order one to actually test. i dont know if its worth doing at the minute.

You need some kind of MOSFET, otherwise it won't make sense. As @Mansi has already said, you may be even able to use the cpu flat cable of the HWFLY/SXCore.

Post automatically merged: Feb 6, 2023

RexSonic said:
What do you need that specific chip for ?

It's a MOSFET (basically an electrical switch)

binkinator · Feb 6, 2023

RexSonic said:
What do you need that specific chip for ?

Check the picture. It’s mosfet. Connecting Sink (4) and Drain (5) but controlled with a Gate (3) from the Pico. That way Pico doesn’t have to supply voltage…it’s using system voltage to do the work. Somebody smarter than me correct if I’m wrong.

Piorjade · Feb 6, 2023

Can anyone decompile the UF2?

Post automatically merged: Feb 6, 2023

Also, I'm wondering why this chip apparently only needs one MOSFET, AFAIK HWFLY and SXCore use two?
This is what I was asking before, one MOSFET controls voltage to the BPMP, but what does the other one control?

Tafty · Feb 6, 2023

OK so I'm allready using the cpu flex for this lite I have a pico installed on.

The only thing that is different from my original install is I don't have chip reset wired up to anything. Any ideas where these need to go

Piorjade · Feb 6, 2023

Tafty said:
OK so I'm allready using the cpu flex for this lite I have a pico installed on.

The only thing that is different from my original install is I don't have chip reset wired up to anything. Any ideas where these need to go

https://github.com/sthetix/DIAGRAM/blob/main/OLED on LITE.png

Post automatically merged: Feb 6, 2023

Look where the blue lines goes

Tafty · Feb 6, 2023

Piorjade said:
https://github.com/sthetix/DIAGRAM/blob/main/OLED on LITE.png

Post automatically merged: Feb 6, 2023

Look where the blue lines goes

thats RST i allready have that in the correction location, im talking about on the other side there is 2 for chip reset that arent on the original wiring diagram

Piorjade · Feb 6, 2023

Tafty said:
thats RST i allready have that in the correction location, im talking about on the other side there is 2 for chip reset that arent on the original wiring diagram

Woops sorry, actually I have no clue why that's there

Post automatically merged: Feb 6, 2023

Also, are these things supposed to be resistors (470 ohm?) ?

Tafty · Feb 6, 2023

Piorjade said:
Woops sorry, actually I have no clue why that's there

Post automatically merged: Feb 6, 2023

Also, are these things supposed to be resistors (470 ohm?) ?
View attachment 351610

they are resistors yes, 47 ohm

51mmz0rz · Feb 6, 2023

Tafty said:
they are resistors yes, 470 ohm

"470" would be 47 ohms (47 is the base number, last digit is multiplier)

https://www.utmel.com/tools/smd-resistor-code-calculator?id=33

impeeza · Feb 6, 2023

Piorjade said:
Woops sorry, actually I have no clue why that's there

Post automatically merged: Feb 6, 2023

Also, are these things supposed to be resistors (470 ohm?) ?
View attachment 351610

No 470 ohms , 47 Ohms:

https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-smd-resistor-code

on three digits, the two first are the "significant" digits and the last one is the number of zeros to add, so 471 is 470 ohms, 477 is 470000000 = 470 Mega Ohms.

Piorjade · Feb 6, 2023

Thanks

Tafty · Feb 6, 2023

my apoligize's these guys are right its 47 ohms

Hacking Hardware Picofly - a HWFLY switch modchip

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